package/fuse-overlayfs: needs headers >= 3.15

package/fuse-overlayfs: needs headers >= 3.15

fuse-overlayfs unconditionally uses SYS_renameat2 since version 0.2 and
https://github.com/containers/fuse-overlayfs/commit/616119093a5d37bf201a7b7970eeb5f7ba32de22
which is not available until kernel 3.15 and
https://github.com/torvalds/linux/commit/5fb6b953bb7aa86a9c8ea760934982cedc45c52b

Fixes:
 - http://autobuild.buildroot.org/results/3c97e25c69ab949e51f04b5d0134bc4b4059982d

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>